ECKELMANN WRG 3010 E, Operating Instruction, Page: 44 / 113

Firmware V1.4 20.05.2021 44/113
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5.11 Calibration of the Pt1000 Temperature Sensor
Due to a very long connection cable from the controller to a Pt1000 temperature sensor, the cable resistance
increases, which results in a measurement error (for more details about this topic, see
Determination of
Measurement Uncertainty). To compensate for such measurement errors, which have an unfavourable effect on
the control and accuracy of the display in the visualisation, an individual offset can be adjusted in the controller
for each temperature sensor to calibrate its measured value.
Configuration
All 15 Pt1000 temperature sensors of the controller and their functions are listed in the " Service Area "
visualisation. The column "Measured Value" shows the temperature (incl. the line resistance) that was
measured at the corresponding terminals. If the measured value deviates from the real temperature, e.g. due to
excessive resistivity, this can be corrected by activating the offset (ON/OFF); the corresponding button then
shows "ON". The required offset can be set between -25 .. +25 Kelvin in steps of 0.1 Kelvin from the measured
value. The performed calibration is then used for control and visualisation and displayed in the "Calibrated
Value" column:
Example for the Pt1000 8 (temperature H
2
O flow LT):
The real, measured flow temperature is 19.7 °C
However, the measured value of 22.0 °C is too high!
The difference is -2.3 Kelvin
Enter and activate the amount for the offset (-2.3 Kelvin) (button is set to ON):
Calibrated, adjusted value: 22.0 °C + (-2.3 Kelvin) = 19.7 °C (for regulation and visualisation)
To make it easier to locate the Pt1000 temperature sensors on the controller, their associated terminals
are displayed in the "Terminals" column, see chapter
Terminal Assignment of the Analogue Inputs .
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